Patent GB-940276-A (GB)
Title: Improvements in or relating to apparatus for regulating the charging pressure of a compressed gas container
IPC: G05D16/20
Filed: 1960-08-23
Abstract: 940,276. Charging compressed gas containers. REGIE NATIONALE DES USINES RENAULT. Aug. 23, 1960 [Aug. 26, 1959; Oct. 6, 1959], No. 29162/60. Heading FIN. A container (not shown) is charged with compressed air from a constant pressure source S Fig. 1 through a main duct 1 to which the container is connected by a union R and a filler valve V and which includes a solenoid valve 13 upstream of a restricted orifice 3 which in turn is upstream of a branch duct 16 leading to a manometer chamber containing a pressure responsive diaphragm 8 serving to actuate switch contacts 24, 25 which when closed energizes a relay 12 to close switch 12<SP>1</SP> and thus open the solenoid valve 13 to allow charging of the container; the contacts 24, 25 being subsequently separated at a predetermined container pressure resulting in the valve 13 being automatically closed. A second solenoid valve 14 upstream of valve 13 is located in a vent duct 2 having a restricted orifice 4 larger than orifice 3, a branch duct 16a leading to the other side of the manometer chamber and having a needle valve-controlled outlet. In operation and on depressing a press-button switch 11, relay 12 is energized to close contacts 12 and open valves 13, 14. The pressure build-up in branch 16a closes contacts 9, 10 to maintain the relay circuit independently of switch 11 and charging continues until contacts 9, 10 are opened by pressure rise in line 1. In a modification switch contacts 24, 25 are actuated by an adjustable lever subjected to the displacement of a piston 23 Fig. 3 a cylinder 22 connected to the main duct 1 by a branch duct 16 downstream of the restriction 3 and solenoid valve 13. On pressing switch 11 to energize the relay 12, contacts 12<SP>5</SP> close to energize valve 13 and contacts 12<SP>4</SP> close to maintain the relay circuit independently of switch 11. In a further modification a solenoid valve EVA Fig. 5 is disposed between the pressure reducer D and solenoid valve EVB in the throttled supply duct 101 having branch ducts 116, 116<SP>1</SP> leading to manometric chambers C, C<SP>1</SP> which are also connected by ducts 115 115<SP>1</SP> to throttled ducts 102 102<SP>1</SP> branching from that portion of the main supply duct between valves EVA, EVB. The other ends of ducts 102 102<SP>1</SP> are vented to atmosphere through needle valves 105 105<SP>1</SP> and the main duct 101 is also vented to atmosphere through a solenoid valve EVC. In operation and assuming the pressure in the container being above that required diaphragm 108<SP>1</SP> closes contacts 109<SP>1</SP> 110<SP>1</SP> to energize relay RA Fig. 6 (not shown) and open valve EVA thereby allowing pressure build-up on the outer sides of diaphragm 108 108<SP>1</SP>; valve EVB remaining closed. The electric circuit is such that valve EVC is then opened to relieve the excess pressure in the container until such time that contacts 109<SP>1</SP>, 110<SP>1</SP> open and contacts 109 110 close whereby valve EVB opens to allow pressure in the container to be made up.